Thanks for writing in HCM.
The condition can be allergic contact dermatitis
, atopic dermatitis
etc.Diagnosis cannot be made without visual clue.
Also few cases of breast cancer can present with eczematous skin lesions of skin over breast and nipple.
.A visit to dermatologist
will confirm the diagnosis.Skin biopsy may be required for diagnosis.I urge you to visit dermatologist at earliest for proper diagnosis.
Till the time you can take tab.Cetirizine 10 mg twice daily .It will decrease itching.
Also you may apply mild steroid like hydrocortisone
1% cream over the rashes.
Hope this helps.