Pediatrics, my son has hand foot mouth, now has rash w little red dots around both knees. Normal? Ok? No fever anymore and in good spirits. 

Normal. Hand foot and mouth also has the rash in other places legs included.
Reassuring. Hand foot mouth disease rash can extend occasionally to arms and legs and diaper area. The rash typically does not bother the child. The mouth blisters can be painful. Rash will resolve in 3-5 days.
Usually OK. Hand-foot-mouth disease is a common childhood illness. To make the diagnosis, you need to see blisters on the palms of the hand, soles of the feet, and in the mouth. However, you can get a rash or blisters anywhere else as well. As you noted, a fever often occurs as well. As long as the fever is gone as he is acting fine, should be ok. Check with doctor if things change.
Viral rash. Enterovirus - the virus that causes hand, foot and mouth can give several different types of rashes. New rash is probably from the virus.
Hand Foot & Mouth. Although, as the name says, the rash is on the hands, feet and in the mouth, it can also occur in other places. The knees are a common spot. As long as he is recovering, and the fever has resolved, it's likely nothing to worry about. If he is worsening, see your doctor.
COXSACKIE VIRUS. Hand foot and mouth disease is caused by coxsackie virus, and usully causes rash in hands, lesions in the oral cavity, and rash inloving soles of feet, but sometimes you can rash on arms and legs as well.It resolves completely without and tratment and there are no saquele of this benign condition in children, it is contagious condition spreads easily in day care anmd schools.
Yes. The hand, foot, mouth disease strain that is circulating this year is causing a lot of strange, peripheral body rashes. No need to worry, this should resolve with 1-2 weeks.
Hand foot and mouth. There are some sequelae of the Hand Foot and mouth rash. But if the rash does not blanch with pressure, I would rather have the child seen by the Pediatrician and tested to make sure his platelets are not too low.
Normal. Children with hand-foot-mouth disease may develop rash over buttock, thigh, genitalia, and knees beside the characteristic blistery rash over hands and feet.