welcome to healthcare magic.
i will be gald to be of help.
such kind of itching in the armpits is usually caused by intertrigo
which is a combination of bacterial and fungal skin infections.
it happens with a lot of individuals.
the treatment is application of clotrimazole
cream and fusidic acid
cream twice a day for 10 days.
oral tablet fluconazole
150 mg one tablet once a week for two weeks.
oral antihistaminic tablet levocetrizine 5 mg once a day at night for 10 days.
dusting after bath with clotrimazole dusting powder daily.
taking bath twice daily will be helpful.