What’s Causing Your Rash? 19 Common Skin Conditions Explained by Glenview Dermatology Experts

Let’s face it—no one likes an itchy, red, or bumpy rash. One minute your skin’s fine, and the next, it looks like it’s throwing a tantrum. Is it serious? Is it contagious? Should you be Googling pictures or calling a doctor? If you live in Glenview, IL, you’re not alone. Our community deals with a range of skin concerns all year round, thanks to the Midwest's changing weather, allergies, and lifestyle factors.

The dermatology experts at On The Spot Dermatology are here to explain 19 of the most common reasons you might be scratching your arm, leg, or even your scalp. And no, not all rashes are the same. Some are harmless, while others need quick treatment.

Here’s your guide to what could be causing that rash—broken down, plain and simple.

1. Atopic Dermatitis (Eczema)

This is the classic childhood rash, but adults can get it too. It causes dry, itchy patches, often in the creases of elbows or knees. Triggers? Stress, soaps, allergies, even the weather.

2. Bullous Pemphigoid

Sounds intense—and it is. This rare condition mostly affects older adults and causes large, fluid-filled blisters. It’s not contagious, but it does require medical attention and prescription treatment.

3. Dyshidrotic Eczema

Tiny, itchy blisters on your hands or feet? You might have this type of eczema. It can feel like you’re walking on sandpaper—or worse. Stress, sweat, or allergens may be the culprit.

4. Mild to Moderate Eczema

If you’ve got itchy, inflamed skin but no blisters or bleeding, this might be where you fall. We can help manage it with moisturisers, gentle cleansers, and—when needed—prescription creams.

5. Folliculitis

Think of this as “angry hair follicles.” It looks like acne but is often caused by bacteria, friction, or shaving. Hot tubs and sweaty gym clothes can also be to blame.

6. Granuloma Annulare

This one’s a head-scratcher—literally. It causes raised, red or skin-coloured rings, often on the hands or feet. It’s not contagious and usually clears on its own, but persistent cases can be treated.

7. Herpes Simplex

Yes, it’s a virus, and yes, it’s common. Herpes simplex can cause painful blisters on the lips (cold sores) or genitals. It’s contagious but manageable with antiviral meds.

8. Hives (Urticaria)

These raised, itchy welts can appear out of nowhere. Common causes? Allergies, infections, or even stress. Most cases go away quickly, but chronic hives may need long-term care.

9. Keratosis Pilaris

Often called “chicken skin,” this harmless condition causes tiny bumps, usually on the arms or thighs. It’s caused by keratin buildup and is more annoying than dangerous.

10. Lichen Planus

An inflammatory condition that causes purplish, flat bumps—sometimes itchy. It can affect the skin, mouth, or even nails. It’s not contagious, but it does need attention.

11. Nummular Dermatitis

Imagine coin-shaped patches of dry, itchy skin—that’s nummular dermatitis. It often pops up in winter and can resemble ringworm, so proper diagnosis is key.

12. Pityriasis Rosea

This rash often starts with one large “herald patch” followed by smaller spots that look like a Christmas tree on your back. It’s harmless and usually clears in a few weeks.

13. Poison Ivy/Sumac/Oak

If you’ve been hiking in Glenview’s forest preserves and come home itchy, these plants might be to blame. The rash appears in streaks or patches and can be intensely itchy. We can ease the reaction with topical treatments and antihistamines.

14. Mild to Moderate Psoriasis

Psoriasis causes thick, scaly patches—commonly on elbows, knees, or the scalp. It’s an autoimmune condition, not just dry skin. Treatments include creams, light therapy, and new biologic medications.

15. Ringworm (Tinea Corporis)

Despite the name, it’s a fungus—not a worm. Ringworm causes circular, red, itchy patches with clear centres. It’s contagious but responds well to antifungal treatment.

16. Seborrheic Dermatitis

This causes flaky, greasy scales on the scalp (a.k.a. dandruff), face, or chest. It’s linked to an overgrowth of yeast and often flares up in winter. It’s manageable with medicated shampoos and creams.

17. Shingles (Herpes Zoster)

If you’ve had chickenpox, the virus can reactivate years later as shingles—painful, blistering rashes on one side of the body. It can cause nerve pain even after the rash heals. A shingles vaccine can help prevent it, especially for adults over 50.

18. Stasis Dermatitis

Seen mostly in people with poor circulation, this rash appears on the lower legs and is often accompanied by swelling or varicose veins. It can lead to ulcers if untreated, so don’t ignore it.

19. Tinea Versicolor

This fungal condition causes light or dark patches on the skin, especially after sweating or being in the sun. It’s common in teens and young adults and isn’t dangerous—just frustrating.

When to See the Pros at On The Spot Dermatology

We get it—not every rash means you need to race to the doctor. But if your skin is painful, not healing, or just making you anxious, it’s time to reach out. At On The Spot Dermatology in Glenview, our team treats you like a person, not just a rash. We take the time to listen, explain, and create a treatment plan that actually works for your lifestyle.

You don’t have to guess, Google, or suffer in silence. From teenagers with breakouts to seniors with chronic skin conditions, we’re here to help you feel confident in your skin again.

Your Skin Deserves Expert Care

Whether it’s a simple reaction or something more serious, your skin is talking to you. Let the professionals at On The Spot Dermatology translate what it’s saying and help you feel better, faster. Book your appointment today and get the answers you need from a team that cares.