Hi, Welcome to HealthcareMagic Forum.
What is your Age and Gender? Generally it is not a cause for concern. Kindly get yourself examined by a Dermatologist
at the earliest to rule out the exact cause so that Proper Treatment can be initiated because without a Proper Physical examination nothing can be Prescribed. It can be due to Eczema, Superficial Fungal Infection
. Treatment depends upon the cause. See your Doctor if it they are increasing in size or number.
Wish you Good Health, Take Care.