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A spa resort near Croatia's capital Zagreb usesa derivative extracted from crude oil deposits totreat skin diseases and arthritis. The treatmentsin Ivanic Grad are attracting a growing numberof patients from home and abroad.

The Naftalan clinic is one of only two places in the world where naphthalene oil, an organiccompound extracted from crude oil, is used for treatment of hard-to-cure skin diseases andrheumatic ailments. The dark oily substance slowly seeps into a row of bathtubs as patientsundress and prepare to submerge up to their shoulders.

One of them is Piotr Khlebtsov, a businessman from Moscow suffering from psoriasis, a diseasethat creates red flaky patches on the skin.

"It's my eighth visit here, at the Naftalan hospital. The therapy has been very helpful for me.The daily therapeutic bath lasts for 15 minutes, and after that one needs to rest in their roomfor about an hour, so that the body recovers," said Khlebtsov.

The Russian patient said he is happy with the results so far.

"This whole area was a red patch, which has become smaller and smaller over time, and isreduced now to just two red dots. And I'm praying to God that this is the year when it goesaway completely," he said.

The Naftalan clinic opened its doors in 1989. Its managers say the idea came from Azerbaijan,where this type of medicinal oil has been in use for some time in a place also called Naftalan.

"Engineers from here, who had travelled to Azerbaijan for work, realized that the oil used therecould be the same kind as the one extracted here, which was already used there to treat somediseases. So they took samples, tested them for chemical composition and concluded that thiswas the same type of medicinal oil that they had over there," said Milica Birk, Deputy Manager ofthe Naftalan hospital.

But the Croatian team says it is using a more refined, distilled oil derivative, unlikeAzerbaijan's facility, which, they say, uses crude oil.

"In medicine we should not really use crude oil, which has some substances that could beharmful. So we had to find a way to produce a distilled version, which still has all the medicinalproperties, while compounds which are not desired were removed. Through cooperationbetween the Croatian oil company experts and our physicians here, we came up with this finalproduct," explained Birk.

Ivanic Grad is located only 25 kilometers from the Zagreb airport. The price of the treatment isa little over $100 a day, which many patients consider low, considering the benefits.

The clinic has recently launched a naphthalene-based line of creams, shampoos, soaps and oils,which can be used for home treatments.