Extensor carpi radialis longus (inside forearm arm) muscle small knot? longish-lump, tension? pain when flexing wrist shoots to upper arm

Lump in muscle : should be evaluated certainly could be any number of benign condition are benign tumor or muscle strain or injury but there's also the possibility that it something more like a sarcoma which is rAre. But not unheard of It's more notable if it's a lump in a muscle if it's truly within the muscle than which muscle one thinks it is. it is in the forearm.