My son has got blisters on his neck due to the rain insect in night. Next day the whole are was red with small blisters, I cleaned it with dettol and applied coconut oil. In the evening I applied candid powder it three day now it has become black and I am continually applying candid powder in day times and coconut oil in night. Should I go for some medication or follow the same routine. Plz suggest, and plz also suggest if there is any cream or ointment for it.