Hello. Thanks for writing to us at healthcaremagic I will keep a possibility of scalp infection. Underlying seborrheic dermatitis Or dandruff is usually a predisposing factor. The lymph nodes are likely reactive due to infection which is present in the area of drainage. I would suggest you to use an antidandruff shampoo e.g Nizoral, which is available OTC. It contains ketoconazole which is an effective anti fungal and anti dandruff ingredient in it. I will also suggest a week of oral antibiotics e.g either flucloxacillin Or Cephalexin for associated scalp infection. Oral antibiotics are prescription products. You may talk to your physician for the needful. Regards