Thank you for asking Healthcare majic. My name is Dr Ehsan Ullah & I have gone through your query. you have mentioned that your husband has Samll hard lump at the Nape of the neck which looked as if it was ingrown hair or pimple...when sqeezing you observed smelly white worm like stuff It s most Probably Sebaceous Cyst. although it has gone but such lumps need complete excision with their covering as they Recur. Sometime , infected lesions or swelling also present with whitish discharge which is Pus ... but this Cheesy whitish stuff is typical of Sebaceous Cyst. you should consult general surgeon for evaluation . Surgical excision of a sebaceous cyst is a simple procedure to completely remove the sac and its contents An infected cyst may require oral antibiotics or other treatment before or after excision. If pus has already formed then incision and drainage should be done along with avulsion of cyst wall with proper antibiotics coverage. Hope this may help you. Let me know if anything not clear. Thanks.