the skin rash
that you have is tinea corporis
. armpits and groins are the commonest areas for this fungal infection
. you need to apply topical antifungal
cream twice a day for around 10-15 days. you can also take antiallergic tablets if there is lot of itching.the armpit area should be kept dry. wear loose cotton clothing to prevent moisture retention in the body folds.
feel free to contact for further queries.