4 Mm Beige Pimple-like Round Nodule 1 And 1/2" From

4 mm beige pimple-like round nodule 1 and 1/2" from nipple (to the right of nipple) on left breast. Pinpoint black "dot" offset in pimple. Could it be a squamous cell CA, similar to the latter which was on the bridge of my nose a few years ago. No bleeding, no discharge, just looks like a pimple. I have been a medical researcher my entire career, still doing so in our local hospital. Not excitable about these things. Otherwise in pretty good health for my age. Early life spent in the sun. Now live in Colorado, 7,500 altitude. If you do not have any idea, do I consult a dermatologist or an OB/GYN. I was Dx with endometrial CA (2a) in 2009. Total hysterectomy and radiation. Not interested in going to extremes re exams, etc. Declined annual mammograms several years ago. Small clear possible cyst in same breast which was growing at < than 1 mm also several years ago. Radiologist was not concerned.