Thanks for posting on HCM
From your description, it sounds like you have developed an abscess/boil with radiation
to the left side of your face. It is also possible that a tumor
is developing there.
You will need the lump examined by your primary care
doctor to determine the actual cause.
Not being able to see the mass myself and determine its characteristics make it difficult to tell the actual cause of the lump. If developing abscess, then you might require a course of antibiotics such as cloxacillin
and antiinflammatory to reduce the pain and the inflammation.
If abscess later on collects, it will require incision and drainage
then continuation of antibiotics to improve complete healing. To answer your question about its contagiousness? It depends on the type of microbe that infected it. Most at times it is staph or strep or other common bacteria that are hardly contagious. But it could be some other atypical bacteria. Avoiding direct contacting the affected person in most instances is the best approach in case the microbe is contagious.
Hope this helps