Thanks for posting your query to HCM.
It appears fro best of your examination that you are having sebaceous cysts in your underarms. The typical of point given by you is visible spots of dead skin in the center- is the punctum of the sebaceous cyst which is almost diagnostic of the problem.
The second possibility could have been simple lymph
node enlargement but as these are asymptomatic so the possibility of first thing is more. Any how for the former -these can be easily excised by a dermatologist
or a surgeon and the second one need not to be worried about. If these increase in size at faster pace or are painful then can meet the doctor and take the best advice to get rid of the problem.
Hope to have best health by this advice,
Dr Sanjay K Kanodia