It appears to be a post-inflammatory papule or nodule, common after a healed pimple or folliculitis, especially in areas like the breast due to friction or hormonal changes.
Usually harmless and settles gradually.
Some topical creams may be advised for faster resolution.
Next Steps
If it increases in size, becomes painful, or doesn’t resolve in a few weeks, kindly consult online
Health Tips
Avoid friction or tight clothing.