Doctor to evaluate
The symptoms of 2 lumps on the neck skin appearing, disappearing, reappearing, for 2 nights.
.. Sounds odd, so a visit to a primary care doctor or a dermatologist will be needed to figure things out. Hives
) can come and go like this, but are itchy. Bug bites, acne
, infected hair follicles, lymph nodes, etc... All can appear as bumps but don't disappear so quickly.