My husband had shingles and I tried several different treatments to gauge their effectiveness and I ended up seeing the quickest healing with a combination of the essential oils Ravintsara and Tamanu, which was recommended by Dr. Kurt Schnaubelt who runs the Pacific Institute of Aromatherapy. This links a combo product he sells, but I just bought them seperately and blended them myself. The healing was dramatic and there were no scars.

https://www.originalswissaromatics.com/Shingles-Magic

The treatment of Shingles (Herpes zoster) with essential oils is as successful as that of Herpes simplex. A notable difference is, however, that because of the pain and aggravation often involved with an outbreak of Shingles, the essential oils utilized need to be totally non-irritant and gentle on the skin.Which oils are used: A combination of equal parts of Ravintsara (Cinnamomum camphora) essential oil and Tamanu (Calophyllum inophyllum) fatty oil has become the standard treatment option for outbreaks of Shingles. Especially with elderly patients this treatment, more often than not, offers stunning relief from the excruciating pain and even more so offers renewed quality of life to patients living with the continuous threat of yet another painful outbreak. Experience has it that once a patient is able to successfully control an outbreak, the frequency and severity of subsequent outbreaks are reduced drastically. Ravintsara is the anti-viral agent within this blend and Calophyllum inophyllum has the unusual, but the highly valuable quality of stimulating phagocytosis. How the oil is used: The oil blend is applied directly on to the lesions. This can be done with a Q-tip or simply by dabbing a few drops onto the lesion with the finger. This is repeated frequently at the beginning of the treatment. (Doing this 4 or 5 times on the first day of treatment is fine).*