Hello and welcome.
Thanks for sharing your concern.

Excessive saliva could be due to the medication that he is taking presently.Is he also taking any antibiotics for upper respiratory tract infection?Bronchitis should be well treated by physician else it is recurrent in nature.

Development of rashes could also be a form of allergic reaction.Therefore please visit MD medicine and get him thoroughly examined.

If left untreated it can aggravate further.After treating the underlying cause salivary flow will come to normal.But in case if you find persistence of symptoms then visit an oral surgeon for clinical evaluation of salivary gland.

Hope it helps.
Thanks.
Take care.

Hello,

Thanks for consulting HCM

Read your query as you have excess saliva in mouth this can be due to gastroesophgeal reflux , pancreitis , oral ulcers , or oral infections I will suggest you to consult oral surgeon for oral examination and rule out the cause .

Hope this will help you.

Thanks for your query, I have gone through your query.
The most common causes for the excess saliva includes any infection in the oral cavity, like gingivitis, periodontitis, ulcers, or tooth infection.
The other possible causes could be secondary to the use of drugs like pilocarpine.
Consult your oral physician and get it ruled out.
If there are any local causes then you have to remove the cause. the possible ways of managing includes,
Drug therapy-Anticholinergics particularly Benzhexol, Benxtropine and Glycopyrrolate are successful in drying the secretions in some people,but has some side effects..and has tobe taken under the prescription of a treating physician.
Surgical-The range of surgical options include denervation of the salivary glands,removal of salivary glands, ligation of salivary ducts and relocation of ducts.
I hope my answer will help you, take care.