Not likely: Allergy to shampoo is of the contact type, and will therefore affect the skin long before it affects the lymph nodes. If you don't have a significant rash all over your scalp (the areas that come into contact with the shampoo), the swollen lymph nodes are probably not related to the shampoo.
Answered 8/7/2017
5.5k views
Yes: Yes those lymph nodes drain the scalp and they can enlarge with any irritation or infection of the scalp.
Answered 7/5/2018
5.5k views
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