Hello,
It can be erythema nodosum,It results in reddish, painful, tender lumps most commonly located in the front of the legs below the knees.
Diagnosis is by physical examination and biopsy of the lesion.Other lab investigations like complete blood count, ESR,ASO titer, urinalysis, throat culture, intradermal tuberculin test, and chest x-ray may also be done.
I would recommend a physician/dermatologist’s evaluation.Treatment depends on the confirmation of diagnosis.
Hope it helps.Take care and pls do keep me posted on how you are doing or in case you have any additional doubts.Kind regards.
May be nummular dermatitis,or stasis dermatitis.Zinc paste would help.