Many people visit a dermatologist when they notice a persistent rash, unusual darkening of the skin, or wounds that won’t heal — only to be told the problem isn’t really a skin problem at all. Skin conditions are one of the body’s most visible ways of communicating that something is off internally. From diabetes and thyroid dysfunction to autoimmune disorders and poor circulation, a wide range of systemic conditions first show up on the surface. If you’ve been treating a skin issue without lasting results, the root cause may lie well beneath the surface — and that’s exactly where an internal medicine physician can help.
At Express Internal Medicine in Plano, Texas, Dr. Iram Qureshi, DO, regularly sees patients whose skin symptoms led them to her door. Rather than treating the skin in isolation, Dr. Qureshi investigates the underlying medical conditions driving those symptoms — and builds a care plan that addresses the real cause. Whether the culprit is undiagnosed diabetes, a hormonal imbalance, or a chronic inflammatory condition, comprehensive internal medicine care can resolve skin symptoms that topical creams and dermatology visits simply cannot fix on their own.
Why Skin Health Is an Internal Medicine Issue
The skin is the body’s largest organ, and it reflects the state of the systems working beneath it. Blood sugar levels, thyroid hormones, circulation quality, immune function, and nutritional status all influence how the skin looks and behaves. When those systems are out of balance, the skin often signals the problem through symptoms like persistent dryness, darkened patches, unusual infections, slow-healing wounds, or itching without an obvious cause.
Internal medicine physicians are trained to look beyond surface symptoms and identify systemic disease. For patients in Plano and the surrounding DFW area, Express Internal Medicine offers exactly this kind of integrated care — connecting the dots between what’s happening on your skin and what’s happening throughout your body.
Common Skin Conditions Linked to Internal Health Problems
1. Acanthosis Nigricans — Dark, Velvety Skin Patches
One of the most telling skin signs of metabolic dysfunction, acanthosis nigricans appears as dark, thick, velvety patches of skin typically found in body folds: the back of the neck, armpits, groin, and inner thighs. Many patients assume this is a hygiene issue or simple hyperpigmentation — but it is frequently a visible marker of insulin resistance, the precursor to Type 2 diabetes.
When insulin levels in the blood are chronically elevated (as occurs in insulin resistance), receptors in the skin are stimulated in ways that cause abnormal skin cell growth and darkening. Acanthosis nigricans is often present years before a formal diabetes diagnosis. Recognizing it early gives patients and physicians the opportunity to intervene — through lifestyle changes, monitoring, or medication — before blood sugar levels progress to a diabetic range.
Dr. Qureshi screens patients presenting with acanthosis nigricans for prediabetes and metabolic syndrome, ensuring that a skin finding leads to a meaningful health conversation, not just a referral for a topical cream.
2. Diabetic Dermopathy — Shin Spots
Diabetic dermopathy presents as small, round, light brown or reddish scaly patches on the lower legs. They’re often mistaken for age spots or minor injuries, but they’re actually caused by changes in the small blood vessels supplying the skin — a direct consequence of chronic high blood sugar. Though generally harmless on their own, these spots are a sign that microvascular damage is occurring and that diabetes management needs attention.
Patients who notice these spots and have not been evaluated for diabetes should be. And for patients already diagnosed with diabetes, new or worsening dermopathy can indicate that blood sugar control needs to be reassessed. This is one of several reasons why comprehensive diabetes care at Express Internal Medicine includes skin-related screening as part of the overall picture.
3. Necrobiosis Lipoidica — Yellowish Waxy Plaques
A less common but more striking diabetes-related skin condition, necrobiosis lipoidica typically appears as yellow-orange, waxy-looking plaques on the shins. These lesions form when collagen in the skin breaks down, often due to diabetic microangiopathy (damage to tiny blood vessels). They can be tender or painful and are prone to ulceration if left unmanaged.
Necrobiosis lipoidica is strongly associated with Type 1 diabetes but can also occur in Type 2 patients. Its presence is a strong signal that systemic diabetes care needs to be evaluated and optimized. An internist managing the underlying condition — particularly blood sugar and circulation — is central to preventing progression.
4. Diabetic Blisters (Bullosis Diabeticorum)
Some patients with long-standing or poorly controlled diabetes develop spontaneous blisters on the hands, feet, or lower legs — sometimes called diabetic blisters or bullosis diabeticorum. These blisters appear without injury or infection and are thought to result from nerve damage and compromised skin integrity caused by chronic hyperglycemia. They can range from small to quite large and, if ruptured, carry a risk of infection.
The presence of diabetic blisters is a warning sign that blood sugar management requires urgent reassessment. Dr. Qureshi approaches these cases with a full metabolic review, wound care guidance, and a revised diabetes management plan aimed at reducing the risk of progression to more serious complications.
5. Slow-Healing Wounds and Diabetic Foot Problems
High blood sugar impairs both circulation and immune response, making it harder for the body to heal even minor cuts and scrapes. This is especially dangerous on the feet, where nerve damage (peripheral neuropathy) can make patients unaware that a wound exists at all. Left untreated, diabetic wounds can become infected, develop into ulcers, and in severe cases lead to limb-threatening complications.
Wound healing evaluation is a critical part of Dr. Qureshi’s diabetes care protocol. She assesses circulation, nerve function, and glycemic control, and coordinates care with specialists when necessary. Early attention to wound care — guided by a primary care physician who knows your full health picture — can prevent minor injuries from becoming major complications.
6. Skin Infections — Bacterial and Fungal
Patients with elevated blood sugar are significantly more susceptible to both bacterial and fungal skin infections. Common presentations include recurring styes, folliculitis (infected hair follicles), carbuncles, and persistent fungal infections such as athlete’s foot, jock itch, and Candida (yeast) overgrowth in warm, moist skin folds.
When a patient experiences repeated or treatment-resistant skin infections, it’s worth asking why the body isn’t defending itself effectively. An internal medicine workup can identify whether underlying diabetes, immune dysfunction, or another systemic issue is creating the vulnerability. Treating the infection without addressing the root cause simply delays the next episode.
7. Eruptive Xanthomas — Cholesterol Deposits on the Skin
Eruptive xanthomas are small, yellowish pimple-like bumps that appear suddenly on the body, often on the buttocks, shoulders, or around joints. They are caused by dramatically elevated triglyceride levels in the blood — a metabolic problem closely associated with uncontrolled diabetes and dyslipidemia. Their sudden appearance is often the first visible sign that blood lipid levels have reached a dangerous threshold.
These lesions are not a dermatological problem — they are a metabolic emergency in disguise. An internal medicine physician can run the appropriate lipid panel and metabolic workup, identify the underlying cause (often uncontrolled Type 2 diabetes or familial hyperlipidemia), and initiate the necessary treatment to bring triglycerides under control.
8. Thyroid-Related Skin Changes
Thyroid disorders — both hypothyroidism and hyperthyroidism — produce distinctive skin symptoms. Hypothyroidism (underactive thyroid) is associated with dry, rough, pale, and cool skin; coarsening of the hair; swelling in the face and around the eyes (myxedema); and thickening of the skin on the legs. Hyperthyroidism (overactive thyroid) can cause warm, moist, smooth skin with a flushed appearance, as well as hair thinning and nail changes.
These changes are often attributed to aging, diet, or climate — but when they appear together or worsen over time, thyroid dysfunction deserves evaluation. A simple blood test for TSH (thyroid-stimulating hormone) can confirm or rule out the diagnosis. Dr. Qureshi routinely screens for thyroid conditions in patients presenting with unexplained skin, hair, or fatigue-related concerns.
9. Itching Without a Rash (Pruritus)
Generalized itching with no visible cause — known medically as pruritus — is one of the more overlooked skin symptoms with internal causes. Chronic kidney disease, liver dysfunction, thyroid disorders, iron deficiency anemia, polycythemia vera, and diabetes can all cause persistent, unexplained itching. When the skin’s barrier function is compromised by metabolic imbalances, nerve signals can misfire and produce the sensation of itch even without an external trigger.
Patients who have been prescribed antihistamines repeatedly without relief may benefit far more from a comprehensive metabolic workup than from another topical prescription. Identifying and treating the systemic cause resolves the itching in ways that creams and pills simply cannot.
The Role of Primary Care in Managing Skin-Related Systemic Disease
Dermatologists specialize in diagnosing and treating skin conditions directly, but they are not always positioned to identify and manage the systemic conditions driving those conditions. Primary care physicians and internists are trained to take the whole-body view — evaluating lab results, reviewing medications, and managing chronic conditions in a way that addresses skin symptoms at their source.
At Express Internal Medicine, Dr. Qureshi coordinates skin-related findings within the broader context of her patients’ overall health. If a patient comes in with recurring skin infections, darkening skin, or slow-healing wounds, she doesn’t just treat the visible symptom — she investigates why it’s happening and builds a plan to resolve the underlying cause.
This approach is especially valuable for patients managing multiple chronic conditions, where a new skin symptom may reflect a change in an existing condition (like worsening blood sugar control) or signal the onset of a new one.
When to See an Internal Medicine Physician for a Skin Concern
While many skin concerns are best handled by a dermatologist, certain situations call for an internist’s evaluation first — or alongside dermatology care:
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• Skin symptoms that coincide with fatigue, unexplained weight changes, increased thirst, or frequent urination
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• Recurring infections (bacterial or fungal) that keep returning despite treatment
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• Slow-healing cuts, sores, or wounds — especially on the feet or lower legs
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• New or expanding dark, velvety skin patches in body folds
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• Unexplained itching that doesn’t respond to antihistamines or topical treatments
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• Skin changes occurring alongside a new diagnosis or change in medications
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• A family history of diabetes, thyroid disease, or autoimmune conditions with new skin findings
If any of these apply to you, scheduling an evaluation with Dr. Qureshi at Express Internal Medicine is a sensible and proactive step.
What to Expect at Your Appointment
When you come to Express Internal Medicine with a skin-related concern, Dr. Qureshi begins with a comprehensive evaluation that goes well beyond the skin itself. She reviews your health history, current medications, family history, and lifestyle factors, and orders targeted lab work to identify any metabolic, hormonal, or immune-related contributors.
Depending on findings, she may recommend a tailored management plan that addresses the root condition — such as initiating or adjusting diabetes management, thyroid treatment, or cardiovascular risk reduction. She will also coordinate with dermatology or other specialists as appropriate, ensuring your care is connected and comprehensive.
Patients leave their appointments with a clear understanding of what’s causing their symptoms, what the plan is, and what to watch for going forward. Same-day appointments are available for new patients.
Frequently Asked Questions
1. Can my skin condition really be caused by diabetes?
Yes. Diabetes is one of the most common internal conditions to produce visible skin symptoms, including dark patches (acanthosis nigricans), skin spots on the legs (diabetic dermopathy), fungal infections, blisters, and slow-healing wounds. If you have undiagnosed or poorly controlled diabetes, skin symptoms are often among the first visible signs.
2. I’ve been treating a skin infection repeatedly and it keeps coming back. What should I do?
Recurrent skin infections — particularly bacterial or fungal ones — often indicate that the body’s immune defenses are compromised. Elevated blood sugar is one of the most common reasons. An internal medicine evaluation can identify whether an underlying metabolic condition is making you more susceptible.
3. Should I see a dermatologist or an internal medicine doctor for my skin issue?
It depends on the nature of your symptoms. If your skin concern is accompanied by systemic symptoms (fatigue, weight changes, increased thirst, frequent urination) or you have known chronic conditions like diabetes or thyroid disease, an internal medicine physician is often the right first step. Both can work together when needed.
4. What is acanthosis nigricans and is it dangerous?
Acanthosis nigricans is a skin condition that causes dark, velvety patches in body folds and is strongly associated with insulin resistance and prediabetes. It is not directly dangerous, but it is a warning sign that metabolic testing and lifestyle intervention are warranted to prevent progression to Type 2 diabetes.
5. My skin is very dry and itchy but there’s no rash. Could this be a medical issue?
Persistent itching without a visible rash (pruritus) can be caused by kidney disease, liver conditions, thyroid dysfunction, diabetes, or iron deficiency, among others. If over-the-counter treatments haven’t helped, a medical evaluation to rule out systemic causes is worth pursuing.
6. How does Dr. Qureshi approach skin-related concerns in a primary care setting?
Dr. Qureshi evaluates skin symptoms as part of the whole health picture, ordering lab work to identify metabolic, hormonal, or immune-related causes and building a treatment plan that addresses the root condition. She collaborates with dermatologists or other specialists when additional expertise is needed.
Schedule Your Appointment at Express Internal Medicine
If you’ve been struggling with a skin condition that hasn’t responded to topical treatments — or if you have risk factors for diabetes, thyroid disease, or metabolic syndrome — Dr. Iram Qureshi at Express Internal Medicine can help you find answers. Our Plano, Texas clinic offers comprehensive primary care and internal medicine services with same-day appointments available.
Phone: (972) 454-9720
Email: contact@expressinternalmed.com
Hours: Monday – Friday, 8:00 AM – 5:00 PM
Location: Plano, Texas
Book an Appointment: expressinternalmed.com/book-appointment
Medical Disclaimer
The information in this article is intended for general educational purposes only and does not constitute medical advice, diagnosis, or treatment. Individual health conditions vary, and the information provided here may not apply to your specific situation. Always consult a qualified healthcare provider before making changes to your health management plan, medications, or lifestyle. If you are experiencing a medical emergency, please call 911 or go to your nearest emergency room immediately.
