So my brother did one big bag cisplatin so far and 8 IMRT radiation treatments. He was just showing me his tongue and it seems like it's turning brown? And a little detached at bottom? Is this normal?

Also, he lost 7 pounds in a week so the doctor said he better start eating or the peg tube will be going in. He said that Everything tastes nasty to him. He had pizza the other day and it tasted like cinnamon sticks.

22 YO Brother Dx 6/17/14 w. SCC R Lateral tongue
CT scan clear LN 6/20/14
HPV-, non-smoker
R tongue, right hemiglossectomy Surgery 6/24/14
(Not reoccurrence but went to NCCC instead
R neck dissection, tracheostomy, radial free flap, R tongue dissection surg 8/11/14
PT1N2B.3 positive lymph nodes out of 13
Extranodal extension present
9-15-14 IMRT (35x) & Cisplatin (2x) begun
10-21-14 peg in. 10-31-14 1 round of carboplatin
11-4-14 IMRT rx comp
3-27-15 Recurrent tumor in lymph node, L neck diss.
10-29-15 brother passed away, 23 yrs old