I get pimples in the summer on my back and chest due to the heat. I also develop redness on my face due prickly heat. How can I avoid this? Answered by our expert Dr Kiran Lohia MD. Prickly heat is very common in India and is typically caused by blockage of sweat glands resulting in red bumps on the chest shoulders and back. The correct treatment involves washes or lotions with salicylic acid and triclosan which act together to reduce gland blockage and prevent bacterial activity. Remember to also stay dry by wearing loose cotton clothing and to bathe with