I have a small lump under the skin on my forearm. it is soft, painless, and rolls around slightly when i run my hand over it. should i be worried?

No worries: Sounds like a lipoma. which is some fatty tissue collected under the skin. A definitive diagnosis can be made by your provider

Skin Lesion: Hello Lori, There are a variety of benign skin conditions (lipomas, fibroademonas, sebaceous cysts, etc...) that may have a similar presentation to what you have described. However, I would still recommend that you seek the evaluation of a physician to determine if there is something more concerning. The possibility of some type of malignancy should be ruled out.