I have a bump on my foot thats big and stings what is it? :// big bump swelled up not red. Skin around it is rougher than rest of my foot amd stings

See a foot doc. Dermatological conditions are often diagnosed immediately on sight and through descriptions can be confusing. For example a "bump" can be interpreted as a bunion, or a callous or a soft tissue mass, but when seen the correct diagnosis can be given in seconds.
Bug bite. It sounds like you had some sort of bug bite.