I don't have much experience with what you are talking about, but if you're worrying about it a lot I'd go see your doctor. Do you have any other symptoms? If you had lymphoma you'd be struggling a lot. Fatigue (Like can't stay awake or climb stairs type of fatigue, not just generally feeling tired), weight loss, etc. Whatever you do, DO NOT GOOGLE YOUR SYMPTOMS. I know it's so incredibly tempting but it'll ruin your entire day. The best thing you can do for yourself is to see your doctor about it and try your best not to worry.