My fatherr had a fall that enjured his knee in the process though theres no obvoius signs of fracture, has some lacerations on the skin,that now appears to have pus.but very superficial.his bruise has been big that turns black all over his knee over a period of 4 days now,also swollen badly, he is diabetic and h1c was quite high as per last blood test.concern whether to take him to emergency due to weekend or wait till monday for his primary doctor.note that we are now out of state for a vacation, since he thought it is just a bruise.please advise .thank u.