<s>[INST] Skull lump hairline behind rt ear -has grown from sz of quarter to length & width 3 fingers -tender to touch -mild painBout week later was very hot to touch bout 3 daysNow extremely itchy rash (looked similar to chicken pox @ first now slightly raised & red still ex itchy)Week before this started -dentist visit -x-rays showed infection lower rt jaw under gum line -no antibiotics given -dentist did 'deep cleaning on 2/3 of teeth avoiding this areaReturning 3 weeks to finish cleaning & removing back molarMentioning dentist visit because I feel maybe relatedThis visit dentist did NOT pretreatment with antibiotics  (as all life been since heart murmur) questioned & was told 'no longer necessary'Again mentioning -feel relatedI am on many medications but no charges for over yearHave auto-immune disorder since cancer & chemo 2001Plz any information would be helpfulAgain feel related this week feel slight pain in ear (like pressure -possibly ear infection -just guessing) but feel it's related to lumps & rashNo new hair products -body or cleaning productsNo recent injuriesAgain...any info appreciated Thank you in advance Sheila May YYYY@YYYY [/INST] Hello,According to my clinical experience, it seems to be of different issues as post-infection lymph node enlargement, sebaceous cyst, or other. If possible, kindly provide a photo picture of the same to evaluate further precisely.Hope I have answered your query. Let me know if I can assist you further.Regards,Dr. Bhagyesh V. Patel </s>