No it donot affect submandibular lymph node  . In Osmf fibrous changes take place in buccal mucose ( inner side of cheek). No lymph node involvement in Osmf Sir . Yes Absutely with 1)STOPAGE OF ALL TOBACCO CONSUMING HABIT. 2) Medicines  SMFibro ,Lycoret (lycopene) 3) Dulimas Forte ointment /Tacrolimus ointment . It takes time to heal  just be patient .

Clinical examination is a must for OSMF. Depending upon the severity only the teatment is planned. C. SM fibro,  once a day,  for 1 months, Very helpful for already diagnosed OSMF cases. Hopefully you stopped your tobacco chewing/smoking or consumption of betal nut or betal quid permanently. Have antoxident rich vegetables and fruits as much as possible. There are certain mouth exercises you need to do to increase your mouth opening, if you have that problem. These are very effective.

Yes true it seems cheek bite, stop deleterious habits of having pan masala, tobacco etc.

It looks like traumatic bite.osmf cannot be diagnosed by looking at the photo.

Can't confirm osmf without physically examining....but it it is so the first step is to get your scaling done and stop consuming the tobacco product whichever u are consuming....and take the medication as per the dentist....and yes it can be cured completely if detected early provided u stop the habit and get the treatment done accordingly