Welcome to the forum. 
Jimdownunder has offered some great advice and as he stated, Parkinson’s comes with a range symptoms and as such, it affects everyone different. What you have described sounds like rigidity which can affect various areas of the body including the face.
In light of your speech problems, you may find speech therapy may help with exercises to keep facial muscles flexible. I’d recommend you see your GP, specialist or Parkinson’s nurse; however, you can call our free and confidential helpline for more information and support on this. Feel free to give us a call on 0808 800 0303 or email us at [email protected].
Best wishes,
Reah
Forum Community Manager