Hi and welcome to HCM,
Cancer sore formation on the oral mucosa
can be due to tissue irritation , inflammation caused by foreign products , trauma , necrosis
of the tissue over a long period. As you have mentioned the placement of temporary crown , i suspect the crown is not in harmony with the adjacent tissues, it may may high occusal points or sharp cuspal margins that is leading to tissue irritation and formation of sores.
i suggest you to visit a dentist
and get the clinical examination done and get the crown repaired or replaced in position.
is the psychostimulant medication which contains amphetamine
, i would suggest you to take this medication only under guidance of a physician as it has many adverse effects. but here it cannot be related to formation of cancer sores. i hope this helps you .