(Journal of Investigative Dermatology, search term "lips")
The first article I read was about exfoliative cheilitis and treatment with hyaluronidase injections to lips. EC never returned in everyone who received injections in lips (injections ranged from 4 or 6 injections to 12 injections). This is the article that claimed EC cure. They also applied a hydrocortisone cream over area where injections done so it would not scab, but that was just during the injections.
I just read the summary of this article. I was searching for more articles and was going to return to it, but then I experienced technical errors. I do not know if it is because the system detected I did not have a subscription, which costs $805 in USA. Hopefully, the site is just experiencing technical problems so the article will be available to read further.
Update: I googled hyaluronidase. It does not make sense why it would heal the lips. I do not if I misspelled it since I had to write it from memory. Isn't this something! Right when I could have found a possible treatment cure, the website malfunctions.
Here's info on the other article:
Mentally disabled individuals with cheilitis were studied. It was concluded they had cheilitis as a result of trauma to lips or chronic, low-grade infection, which caused lip hypertrophy, scaling, crusting, and fissuring. The cause of the hyperkeratosis was not determined.
Treatment included the combination of dried thyroid, vitamin A, and small doses of hydrocortisone tablets. After stopping treatment, their lips soon returned to former state of fissuring and hyperkeratosis.
The study also stated eczema disappeared in those placed on a low phenylalanine diet, which corrects biochemical abnormality.
"L-Phenylalanine is biologically converted into L-tyrosine, another one of the DNA-encoded amino acids. L-tyrosine in turn is converted into L-DOPA, which is further converted into dopamine, norepinephrine (noradrenaline), and epinephrine (adrenaline). The latter three are known as the catecholamines.
Phenylalanine uses the same active transport channel as tryptophan to cross the blood–brain barrier, and, in large quantities, interferes with the production of serotonin."