could a reddish sore spot lump under armpit be cancerous
Armpit lumps, or enlargements of one or both of the lymph nodes under the arm, can be cancerous, but may also be an indication of a viral infection such as shingles or chickenpox, a skin irritation stemming from shaving, an allergic reaction to deodorant or other products, or a cyst or boil.
Whether you feel these lumps may be cancerous or common, I highly advise you to see your physician and accordingly, the doctor may or may not order additional testss. However, If the lump is painful and can be rolled around chances are, it may be a cyst of some kind and can be easily treated.