Ay, ganyan din ako dati! Muscle cramps sa gabi are so annoying, lalo na pag tumatagal ng a week after. From what I've heard, it could be from nerve stuff, restricted blood flow, or even stress, nakakapagod kasi ang mama life, di ba! Try stretching that leg gently before bed, stay hydrated during the day, at maybe magpainit ng banyo sa affected area pag sumasagot ang cramp; my neighbor swears by warm compress at gentle massage kasi nakatulong sa kanya. The violet bump sounds concerning though, definitely worth mentioning to your doctor just to be safe, basta marinig mo lang na it's not something pressing lest it gets worse pa.