Welcome at HCM I have gone through your query and being your physician I completely understand your health concerns..... Which type of shoes you are wearing? Is there any history of tick bite or trauma? Is there consistent pain? Any boil on the affected foot? In context of your history it could be either infection like cellulitis or bursitis but it need to be examined by orthopedic surgeon. If it is red and you are feeling like pressure from inside then meet your doctor immediately... It could be due to compartment syndrome. So meet your doctor for definitive diagnosis ... Meanwhile stay calm and use acetaminophen to relieve pain. Avoid too much movement at affected foot. Get well soon Regards Dr saad Sultan