Hello, my name is Dr.Dorina Gurabardhi. I understand your concern.
One of the common causes of a lump is sebaceous
cyst.It is a sac filled with a greasy material (sebum) caused by plugged ducts at the site of a hair follicle.
Some advices that I can give to you are :
-Do not squeeze, scratch, drain, open (lance), or puncture the lump.
-Keep the area clean by washing the lump and surrounding skin well with an antibacterial soap.
-Apply warm, wet washcloths to the lump for 20 to 30 minutes, 3 to 4 times a day.
-If the lump begins to drain pus, apply a bandage to keep the draining material from spreading. Change the bandage daily.
Hope my answer was helpful, if you have any other questions I'll be glad to help, thanks!