4 (also monitor lizard) A large tropical Old World lizard with a long neck, narrow head, forked tongue, strong claws, and a short body. Monitors were formerly believed to give warning of crocodiles.Called goanna in Australia. (also monitor lizard) A large tropical Old World lizard with a long neck, narrow head, forked tongue, strong claws, and a short body. Monitors were formerly believed to give warning of crocodiles.
The most effective way to prevent black toenails is to run in shoes that fit properly. You should have a thumbnails width room between your big toe and the front of your shoe while standing, not sitting. You should also wear moisture thin, moisture wicking socks to prevent increased heat build-up.
Treatment: 1  You can use antifungal medication such as itraconazole (Sporanox) and terbinafine(Lamisil). This will help you grow new infection-free nails. 2  You can also apply medicated nail polish to clear the infection. 3  To reduce pressure on the area, it is advisable to trim the nails. This will also make the black spot accessible when applying an antifungal. If the infection is severe, you might have to have the affected nails removed surgically. 5. Skin Cancer. Black spot on toenail can also be caused by acral lentiginous melanoma. This is a type of skin cancer that often appears on the big toe. The affected area may have vertical borders that change with time.