Hi thanks for your question.Your 35 year old male having swelling above nipple,(right or left not mentioned) which is sore to touch,there are few possibilities ,what this could be ?
1. Mild injury
ti this part of body with super added infection,since your doing weight lifting training,so bound to get trauma on chest while lifting weight
2. Infection of the hair follicle called as boil,which may be spreading condition called as cellulitis
, inflammation of breast ,since you taking testosterone
4 Last of and rare possibility of male breast cancer
Take a course of antibiotic for a week ,if still persists,you have to consult Doctor
Hope i answered your question