What would happen if left cellulitis untreated? will it always get worse or would it resolve itself

Treat cellulitis: If cellulitis is untreated, especially if it's bacterial cellulitis, it can progress to a condition called necrotizing fasciitis. This is life threatening and not a condition to be taken lightly. So, bacterial infections of the skin must be treated promptly with antibiotics, and in cases of cellulitis, oral antibiotics are often used.

Cellulitis: There is a significant risk that it will continue to worsen. Results could be catastrophic. Please get medical attention now if you have cellulitis. Take care.

Cellulitis.: Cellulitis is a bacterial infection of the skin. It's superficial and treatable with antibiotics, either topical or oral. Some infections can be very severe and possibly deadly (MRSA), so don't take cellulitis lightly. See a doctor if you have symptoms of redness, warmth and tenderness of an area of your skin, especially if you have fever, chills or sweats.