It sounds like you may be experiencing photosensitivity or a heat-related skin reaction. To prevent this, apply a broad-spectrum, mineral sunscreen containing zinc oxide or titanium dioxide (SPF 30+) daily. Wear protective clothing and limit sun exposure during peak hours. To manage active redness and swelling, apply a cool compress and use a mild, over-the-counter topical hydrocortisone cream (1%) to reduce inflammation. An oral antihistamine, such as cetirizine or loratadine, can also help soothe itching and swelling. Moisturize with plain aloe vera or calamine. If your symptoms persist, please consult a dermatologist for a tailored treatment plan.

Yes, you may apply Markal Calamine Lotion (Bentonite, Calamine, and Glycerin) to the affected area to help soothe irritation and provide a cooling effect. Calamine can reduce itching and discomfort, while glycerin helps keep the skin moisturised. Apply it gently without rubbing or breaking the blisters, as this may cause a secondary skin infection. However, the lotion will not treat the shingles virus itself, so continue any antiviral medication prescribed by your doctor. Seek medical advice promptly if the pain, redness, or spreading of the rash worsens.