The pictures seem to be an mismatch to patient profile 31 male. Lymph nodes of the mentioned size in these regions are mostly a reaction to local infection. Make sure to use anti dandruff shampoo and you can take a course of antibiotic. If they seem to grow in size or become painful/ red, biopsy may be needed later
Next Steps
Maintaining good dental and scalp hygiene
Health Tips
Review after 4 weeks to a local physician for further work up if they persist