Lump on Neck

Hi All Just wondering if anyone knows that this lump is: https://europe1.discourse-cdn.com/flex018/uploads/patient/upload-sm/upload-sm/1210530-637239336013266593.jpg I have had it there for 6 months or more but it was just the white piece and felt much smaller to touch. Over the last 2 days it has got larger and red around it, it is also slightly tender and itchy. Thanks In advance

From comparing most conditions, the closet I have found it to match is Sebaceous Cyst.

Anyone know if I'm overlooking anything? Thanks

Yes, either a sebaceous cyst or an infected hair follicle. Just keep it very clean. It may start to discharge pus. If you get a lot of these you need to see your doctor but they are quite common.

Thanks Marina

An infected hair follicle also makes sense. My wife gave me a DIY haircut last weekend, and the clippers had not been used in a long time so may not have been 100% clean.

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Seems to be getting a bit bigger and the lump is hard and tender. How long before I would expect this to go down? Thanks

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Getting a bit worried about this now, seeing lymphoma come up in some searches. I have a video consult booked with a doctor tomorrow.