Dear user, Thanks for the question. The lump you have described fits the description of a skin cyst, called Sebaceous Cyst. The first thing about them is they are non-cancerous. These happen because of ingrowing of hair with an excessive secretion of glands around it to raise the bump. So although they can occur on part of body, these are more likely to appear in the parts which are hairy and shaved. other sites could be face, neck, and torso. The contents which come out of it will be thickened and could have black in it because of the hair. it is less likely for an insect to embed in the skin, especially when there was no redness to suggest insect bite. Now that you have already emptied it, it might or might not collect again. If it does, you will need to get it removed. As if this cyst it recurrent or stays for long, there are chances that it gets infected. In the case of infection, you will need a course of antibiotics plus minus require drainage if the antibiotics don t help or abscess forms. Hope I answered the question and related concerns. Plaese write back if you need further information. Thanks