Suggest Medicines For Skin Rashes

I came from delhi to bagdogra. 2days after reaching bagdogra ihave developed some rashes on the skin.the weather in delhi was dry but here it very humid.Last year also when I visited Mumbai in the month of june I had this problem but it was soorted automaticaly when I returned to delhi after one without taking any medicine. But now as I have at this place for two months i have to take some medicine.I had a talk with my doctor friend who asked me to take ampoxin 500 tds for three days.What is your advice regarding this.I am 62 yrs of age,ht 5ft7inches and weight is around 80kg