Fluid filled lump under the neck, swells upon sweating. Dangerous?
Hi..im having a small pea sized pimple under my neck for last 4 years...it sometimes swells a bit n becomes dark pink...especially when sweating,or some cloth rubbed on it i wear..and sometimes it goes flat bt its to much prominen...it doesnt open or bleed eva however i can see whitish water like fluid inside the centre...i want to know what is it? harmful ? and what should i do