Itchy Skin Bumps: Possible Causes and Treatments - Dermatology

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Occasionally, I develop a rash similar to heat rash?


Hello, doctor.
My father is 62 years old and occasionally experiences symptoms resembling heat rash, with small bumps that are skin-colored when not scratched.
However, when he scratches them, they become very itchy and turn red with a rough texture.
These bumps are located on the inner arms and the front of the thighs.
They usually disappear in about two days, but this time they have persisted for five days without resolution.
Could you please advise what this might be? Thank you! :)

RITA, 30~39 year old female. Ask Date: 2018/11/27

Dr. Li Yufen reply Dermatology


Hello: Based solely on the textual description, it is not possible to accurately diagnose a skin condition.
If your father's skin symptoms do not improve or worsen, it is advisable to consult a nearby dermatologist for diagnosis and treatment.
Thank you!

Reply Date: 2018/11/27

More Info


It sounds like your father is experiencing a common skin condition that could be related to several factors, including allergic reactions, irritant contact dermatitis, or even a form of eczema. Given the description of small, itchy bumps that become red when scratched, it is possible that he is dealing with a condition known as papular urticaria, which is often caused by insect bites, or it could be a manifestation of eczema, particularly if he has a history of sensitive skin.


Possible Causes
1. Allergic Reactions: Allergies can manifest as itchy bumps on the skin. These can be triggered by various allergens, including certain foods, medications, or environmental factors like pollen or pet dander. If your father has recently been exposed to any new substances, this could be a potential cause.

2. Irritant Contact Dermatitis: This occurs when the skin comes into contact with an irritating substance, such as soaps, detergents, or certain fabrics. If he has been using a new soap or detergent, this could lead to localized irritation and the symptoms you described.

3. Eczema: This is a chronic condition characterized by dry, itchy skin that can lead to red, inflamed patches. Eczema can flare up due to various triggers, including stress, temperature changes, and allergens. If your father has a history of eczema, this could be a recurrence.

4. Papular Urticaria: This is a hypersensitivity reaction to insect bites, often seen in children but can occur in adults as well. It presents as small, itchy bumps that can become red and inflamed when scratched.

5. Folliculitis: This is an inflammation of the hair follicles that can cause small, red bumps. It can be caused by bacteria, fungi, or irritation from shaving or tight clothing.


Treatment Options
1. Topical Corticosteroids: Over-the-counter hydrocortisone cream can help reduce inflammation and itching. Applying this to the affected areas may provide relief.

2. Antihistamines: Oral antihistamines can help alleviate itching, especially if the bumps are due to an allergic reaction. Medications like diphenhydramine (Benadryl) or cetirizine (Zyrtec) can be effective.

3. Moisturizers: Keeping the skin well-hydrated can help prevent dryness and irritation. Look for fragrance-free moisturizers to avoid further irritation.

4. Avoid Scratching: Encourage your father to avoid scratching the affected areas, as this can worsen the irritation and lead to secondary infections.

5. Identify Triggers: If possible, try to identify any new products or environmental factors that may have triggered this reaction. Keeping a diary of symptoms and potential triggers can be helpful.

6. Consult a Dermatologist: If the bumps persist beyond a week or worsen, it would be wise to consult a dermatologist. They can provide a definitive diagnosis and may recommend prescription-strength treatments or further testing if necessary.


When to Seek Immediate Care
If your father experiences any of the following, seek medical attention promptly:
- Severe swelling or difficulty breathing, which could indicate an allergic reaction.

- Signs of infection, such as increased redness, warmth, or pus.

- If the bumps spread rapidly or do not improve with over-the-counter treatments.

In summary, while the symptoms your father is experiencing are likely related to a benign skin condition, it is essential to monitor the situation closely. If the bumps do not resolve or if they worsen, a visit to a healthcare professional is warranted for a thorough evaluation and appropriate management.

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