Hello dear. The red discoloration of your upper chest and neck may not be due to your medications as none of those have it as most common side effect. However any drug can cause allergic reaction in some people which may lead to rashes. You need to consult a dermatologist who will take detailed history and evaluate you. Do you have itching in those areas? You can try some home remedies initially by applying coconut oil in those areas, and also chweing neem leaf daily morning on empty stomach. If it is some infection some antifungal creams like candid may help. But if still persisting kindly consult a dermatologist. Hope i have answered your question. Feel free to contact me if you have any more questions. I ll be glad to help you. All the best With warm regards Dr Sanjay Kini