Lohitanga, also known as Angaraka, Mangala, or Bhauma, is the god of the planet Mars. The story of his birth is told in this excerpt from the Rudra Samhita of the Shiva Purana, although it differs significantly from the story told in "Devon Ke Dev Mahadev". (TV serials tend to take quite a lot of artistic license.) In this account, after the death of his first wife Shakti, Shiva is devastated so he engages in Tapasya (deep meditation) for several years. Eventually he starts sweating out of exhaustion, and drops of sweat from his forehead fall onto the Earth, where they turn into a baby boy. Since the boy was born on the earth, Bhumidevi the goddess of the earth raises the boy with Shiva's permission. Thus the boy acquires the name Bhauma or son of Bhumidevi. He then worships Shiva at Kashi (Varanasi) for a long time, and as a result Shiva makes him into the planet Mars.
By the way, from what I can gather, "Devon Ke Dev Mahadeva" also depicts Bhauma being raised by the demon Andhakasura. I don't think there's any scriptural basis for that, but it's interesting to note that Andhakasura does have one connection to Bhauma: just as Bhauma was born out of Shiva's sweat, Andhakasura is said to be born out of Parvati's sweat. (Another thing that was born from Parvati's sweat was the Bilva tree, as I discuss in this answerthis answer.)