I'm seeing these itchy red bumps that look like pimples on my forearms and ears. They first appeared two days ago on my hands and ears but have now spread to my forearms. They're not on my biceps or shoulders, which are usually covered by my t-shirt. Could this be related to the weather change? I was driving in the sun two days ago during the daytime and started noticing these patches afterward. What do you think?

Dr Shubham Chauhan

General Practitioner

• MBBS
• 4+ Yrs

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Causes*

1. Sun Allergy (Polymorphic Light Eruption): Exposure to sunlight, especially during peak hours, can trigger an allergic reaction, leading to itchy red bumps.
2. Phototoxicity: Certain medications or skincare products can react with sunlight, causing a phototoxic reaction, which may present with similar symptoms.
3. Contact Dermatitis: Exposure to an allergen or irritant, such as soap, detergent, or plant sap, can cause a skin reaction, especially on exposed areas like forearms and ears.
4. Heat Rash (Miliaria): Prolonged exposure to heat and sunlight can cause heat rash, characterized by small, itchy bumps.

Next Steps

1. Seek shade and avoid further sun exposure: Until the symptoms resolve, limit your time in the sun, especially during peak hours.
2. Apply cool compresses: To reduce itching and inflammation, apply a cool, wet compress to the affected areas.
3. Use topical creams or ointments: Over-the-counter hydrocortisone cream or calamine lotion can help alleviate itching and inflammation.

Answered 04/07/2025