Thanks for the query.
You might have developed furuncles
These are deep bacterial infections.
Recurrent spots at different places suggest that you have an infection.
Treatment is with antibiotics.
Doxycycline is also an antibuotic. but the choice of antibiotics should be based on culture and sensitivity tests.
Please meet a dermatologist
for exact diagnosis.
Let me know if you have any other doubt.
you can ask a direct question to me on this forum, following the below link.
Wishing you a good health.