My 2 year old son has a cluster of small bumps on his ribcage. They are skin colored kind of look like a whitehead but as far as I can tell there is nothing inside just hard bumps. Some are bigger than others but the largest one is still only the size of a large whitehead. My other son had something like this on his neck and the doctor said they were like warts cause they have a seed and you have to wait for your body to build up an immunity to them and they will eventually go away. Could these have spread to my other son?