Evaluation of the Photobiomodulation Using LED Lamp for Curative Treatment of Radio-induced Mucositis.

Inclusion Criteria: * Age \> 18 years old * With squamous cell carcinoma of the head and/or neck * Stage 1 or 2 mucositis (NCI-CTCAE v5), wich means a mucositis not requiring an enteral nutrition management (solid or liquid alimentation possible, including with feed supplements) in week 2 to 4 in relation to the beginning of radiotherapy. * During treatment by radiotherapy, with or without concomitant chemotherapy * Patient affiliated to a social security system * Patient who signed the informed consent for this study Exclusion Criteria: * Radiotherapy treatment completed * Stage 3 or higher mucositis already installed * History of skin porphyria or lupus erythematosus * Concomitant or within 7 days prior to inclusion, at least one of following drugs : fluoroquinolones, cycline, methotrexate, auranofine * Enteral nutrition support in progress * Pregnant or breast-feeding woman * Patient under guardianship or curatorship